fix(sqlite): support .db3 file extension

apps/desktop/src/App.vue

@@ -592,7 +592,7 @@ async function openPendingSqlFiles() {
   }
 }
 
-const DB_EXTENSIONS = [".db", ".sqlite", ".sqlite3", ".duckdb"];
+const DB_EXTENSIONS = [".db", ".db3", ".sqlite", ".sqlite3", ".duckdb"];
 
 function getDbTypeFromPath(path: string): "sqlite" | "duckdb" | null {
   const lower = path.toLowerCase();

apps/desktop/src/components/connection/ConnectionDialog.vue

@@ -2001,7 +2001,7 @@ async function createDuckDbFilePath() {
 }
 
 function ensureSqliteFileExtension(path: string): string {
-  return /\.(db|sqlite|sqlite3)$/i.test(path) ? path : `${path}.db`;
+  return /\.(db|db3|sqlite|sqlite3)$/i.test(path) ? path : `${path}.db`;
 }
 
 async function createSqliteFilePath() {
@@ -2010,7 +2010,7 @@ async function createSqliteFilePath() {
   const selected = await save({
     title: t("connection.createSqliteFile"),
     defaultPath: "database.db",
-    filters: [{ name: "SQLite", extensions: ["db", "sqlite", "sqlite3"] }],
+    filters: [{ name: "SQLite", extensions: ["db", "db3", "sqlite", "sqlite3"] }],
   });
   if (!selected) return;
 

apps/desktop/src/composables/useFileDrop.ts

@@ -7,7 +7,7 @@ import { useToast } from "@/composables/useToast";
 import * as api from "@/lib/api";
 import type { ConnectionConfig } from "@/types/database";
 
-const DB_EXTENSIONS = [".db", ".sqlite", ".sqlite3", ".duckdb"];
+const DB_EXTENSIONS = [".db", ".db3", ".sqlite", ".sqlite3", ".duckdb"];
 
 function getDbType(path: string): "sqlite" | "duckdb" | null {
   const lower = path.toLowerCase();